Having a person who knows little more than making a computer understand a camera would have made no sense with a lean team on a small startup.
When one of the big selling features of your product is it’s ability to “understand a camera”, having somebody with substantial CV experience would have made sense even for a tiny Glowforge. Possibly more sense, since they could do more impressive things and further differentiate themselves from the competition
And why would they be capable of “little more” than CV? Many are talented programmers and CV wizards
Glowforge may have been privately hunting for some time already, or maybe they already have semi-decent CV programmers, or some other mitigating factor (how much can anybody really read into a single job advert?) but personally I would be a bit surprised if they actually had left it this late to pursue proper help with CV. Software can always be improved later as @dan_berry says, but if you make a hardware mistake that will forever cripple your software’s capabilities, it’s better to find that out from an expert before you set too much in stone